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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9615b25753f77f073ad3396b33c4ba627d6499edea2e892c9dc1e1192e79c916' 
  AND token = 'lavFt6oHfE+Ni+oACOJeWBbFFAliUR0sa9WHYAp+40Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}